root = new GLtk::Root(ui_res, window);
mouse.signal_button_press.connect(sigc::mem_fun(this, &Engineer::button_press));
mouse.signal_axis_motion.connect(sigc::mem_fun(this, &Engineer::axis_motion));
root = new GLtk::Root(ui_res, window);
mouse.signal_button_press.connect(sigc::mem_fun(this, &Engineer::button_press));
mouse.signal_axis_motion.connect(sigc::mem_fun(this, &Engineer::axis_motion));